Antec True Control 550 Control panel installs in 5.25" drive bay and still supports a 3.5" drive. Adjust voltage outputs and minimum fan speed from the front of your case. User-adjustable, individual dedicated circuits for main +3.3V, +5V, and +12V outputs. Dedicated output circuitry for each voltage output Voltage Feedback to maintain accurate voltage to all components: adds stability to your system.